[英]How to fetch data from a column and display that data using 2 columns in PostgreSQL?
[英]how to fetch row on the basis of json data stored in a column in Postgresql
我有一張這樣的桌子
| is_selcted_cours | content | value |
| (boolean) |(json) | |
------------------------------------------------------------------------------
| true | {"date":"07-Apr-2020","amount":"5050","type":"CT"} | 1 |
| false | {"date":"07-Jun-2020","amount":"50","type":"CT"} | 1 |
| true | {"date":"10-Aug-2020","amount":"6050","type":"MT"} | 1 |
| false | {"date":"07-Jun-2020","amount":"50","type":"CT"} | 2 |
| true | {"date":"07-Apr-2020","amount":"5050","type":"GT"} | 3 |
| true | {"date":"07-Apr-2020","amount":"5050","type":"GT"} | 3 |
| true | {"date":"07-Apr-2020","amount":"5050","type":"GT"} | 3 |
我想獲取所有重復的行(這里重復意味着包含is_selcted_cours is true
並且the value of date, amount in the content column
具有相同的值),就像在這個表中選擇的行將是1,5,6,7
我會為此使用 EXISTS 條件:
select d1.*
from data d1
where is_selcted_cours
and exists (select *
from data d2
where d1.content ->> 'date' = d2.content ->> 'date'
and d1.content ->> 'amount' = d2.content ->> 'amount'
and d2.is_selcted_cours = d1.is_selcted_cours
and d1.id <> d2.id)
d1.id <> d2.id
是不將行與自身進行比較所必需的。 id
被假定為主要(或唯一)鍵列。
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